unique URL's as ID in mysql table

[Norman Khine]

hello, i have a mysql database that stores URL's in a table now i
would like to change the schema so that the URL's are unique so my
question is: is it appropriate to use URL's as a unique IDs if not
what are the alternatives?

any advise much appreciated

norman

-- 
˙uʍop ǝpısdn p,uɹnʇ pןɹoʍ ǝɥʇ ǝǝs noʎ 'ʇuǝɯɐן sǝɯıʇ ǝɥʇ puɐ
'ʇuǝʇuoɔ
ǝq s,ʇǝן ʇǝʎ
%>>> "".join( [ {'*':'@','^':'.'}.get(c,None) or
chr(97+(ord(c)-83)%26) for c in ",adym,*)&uzq^zqf" ] )